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Old 06-19-2020, 07:06 PM   #1
Join Date: Mar 2018
Location: MO
Posts: 199
Year: 1978
Engine: Detroit 6-71
78 Crown Bus electrical

Hi everyone, we have been working on our 78 Detroit 671 Crown Bus over the last 2 years. I recently added a water pump for our kitchen and I am starting to make a battery bank to power the pump as well as power things like our Refrigerator.

At the moment we don't plan on going solar due to price and us only using the bus for extender 2-3 week trips tops and summer weekend get aways.

I currently have 50amp AC panel for powering all our AC electrical devices. We plan on getting a fridge. We are most likely going to go with one that is 120 volt AC powered. However when on the road and not connected to shore obviously this will be a problem. I would like to make a battery bank to power our 12volt water pump and connect a pure sine inverter to power the fridge. I would like this battery bank to be charged by the alternator when we are on the road so that our fridge can run and not have to be turned off because of discharging the house batteries.

I have read and I guess I need a Biodirectional Relay so that the alternator charges our bus batteries as well as the battery bank house batteries. Is this correct how would the wiring look? Our bus is 1978 and it has a 130amp Alternator (link here: )

would this Alternator be able to handle it? Any help would be greatly appreciated. I am attaching a couple pictures of our bus
Attached Images
File Type: jpg IMG_20200614_115555.jpg (397.1 KB, 3 views)
File Type: jpg IMG_20200613_071931.jpg (256.0 KB, 2 views)
File Type: jpg IMG_20200612_003451.jpg (209.1 KB, 3 views)
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